fix crash bug

[mdre3a]

trafficstars

fix this bug: goroutine 97 [running]: panic: runtime error: index out of range [1] with length 0 x-ui/xray.(*process).GetTraffic(0xc0006be0f0?, 0x1) x-ui/xray/process.go:265 +0x7e9 x-ui/web/service.(*XrayService).GetXrayTraffic(0x40da7d?) x-ui/web/service/xray.go:88 +0x4e x-ui/web/job.(*XrayTrafficJob).Run(0x1cf6118) x-ui/web/job/xray_traffic_job.go:21 +0x5f github.com/robfig/cron/v3.(*Cron).startJob.func1() github.com/robfig/cron/[email protected]/cron.go:312 +0x6a created by github.com/robfig/cron/v3.(*Cron).startJob github.com/robfig/cron/[email protected]/cron.go:310 +0xad

[kilvn]

@FranzKafkaYu